Start from the coast of Holland to the German border near Arnhem.
And I find some uncovered map features.
1 - sand beach. (give no problem).
2 - harbour area. (how to prevent amphibious units from/to a Port quay) to high think?
3 - heavy industry area. (how to prevent heavy artillery and/or air-strike).
4 - [road]tunnels. Not only road-tunnels for crossing rivers but how to deal with mountain tunnels?


